PowerReader Lite vs HtmlFox

PowerReader is a simple but powerful reading tool.
 Features: 
 - It is available to view the files with various formats as below: txt, pdf, png, jpg, tiff, gif, bmp, htm, html, doc, xls, ppt, docx, xlsx, pptx. - Supports landscape view mode. - Diverse kinds of encoding for txt reading. - Turning pages forward or backward quickly. - Uploading files through iTunes. - Automatic line breaks. 
 - Full text search, you can easily search the entire text. - Online Translation engine. - Automatically save the last reading point. - Automatically separate the big txt file to accelerate the access speed - More features in full edition: - It is also available to play mp3 & mp4 files. - Supports Google docs downloading. - Supports "Open-in" feature, you can open the supported data from mail, safari or some other APPs that supported open-in feature. - Various types of font for txt reading. - Text color and background color setting. - Bookmark feature. - Single/multi page display for PDF viewer.

HtmlFox is a lightweight HTML document editor and preview tool for iPhone and iPad. Open local .html, .htm, and .xhtml files from the Files app, preview them instantly, search page content, edit source code, and export your work as HTML or PDF. Key features: • Open local HTML and XHTML documents • Preview pages in a clean reading view • Search within page content • Edit HTML source code • Export edited documents as HTML • Export previews as PDF • Reopen recent documents quickly • Distinguish same-name files by source path • Works without an account HtmlFox is designed for local documents. Your files and recent file information stay on your device and are not uploaded to the developer. Editing and export are available with HtmlFox Pro, a one-time in-app purchase with no subscription. The app includes local introductory access so you can try Pro features before unlocking.